1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 34

G 34

CAP. 60

Import and Export (Strategic Commodities) Regulations

[1988 Ed.

[Subsidiary]

IL 1371

(2) Linear induction motors used as drives for slides, having all of the following characteristics:

(1) Stroke greater than 200 mm;

(ii) Nominal force rating greater than 45 N;

(iii) Minimum controlled incremental movement less than 0.001 mm;

(d) Specially designed accessories, i.e. single point diamond cutting tool inserts having all of the following characteristics-

(1) Flawless and chip-free cutting edge when magnified 400 times in any direction; (2) Cutting radius between 0.1 and 5 mm;

(3) Cutting radius out-of-roundness less than 0.002 mm TIR (peak-to-peak).

Technical Note:

Machines will be evaluated under the conditions yielding the most accurate values, including but not limited to the incorporation of control systems which permit mechanical, electronic and "software" compensation.

Anti-friction bearings, as follows-

(4) Ball and roller bearings having an inner bore diameter of 10 mm or less and tolerances of ABEC 5, RBEC 5 (or national equivalents) or better and either of the following characteristics--

(1) Made of special materials, i.e. With rings, balls or rollers made from any steel alloy or other material (including but not limited to high-speed tool steels, Monel metal, beryllium, metalloids, ceramics and sintered metal composites), except the following: low-carbon steel, SAE-52100 high carbon chromium steel, SAE-4615 nickel molybdenum steel, AISI-440C (SAE-51440C) stainless steel (or national equivalents);

(2) Manufacture for use at normal operating temperatures over 150°C (302°F) either by use of special materials or by special heat treatment;

(b) Ball and roller bearings (exclusive of separable ball bearings and thrust ball bearings) having an inner bore diameter exceeding 10 mm and having tolerances of ABEC 7, RBEC 7 (or national equivalents) or better and either of the following characteristics:

(1) Made of special materials, i.e. with rings, balls or rollers made from any steel alloy or other material (including but not limited to high-speed tool steels, Monel metal, beryllium, metalloids, ceramics and sintered metal composites), except the following: low-carbon steel, SAE-52100 high carbon chromium steel, SAE-4615 nickel molybdenum steel, AISI-440C (SAE-51440C) stainless steel (or national equivalents);

(2) Manufactured for use at normal operating temperatures over 150°C (302°F) either by use of special materials or by special heat treatment;

(c) Ball and roller bearings having tolerances better than ABEC 7 (or national equivalents);

(d) Gas-lubricated foil bearings;

(e) Bearing parts usable only for bearings covered by this item, as follows: outer rings, inner rings, retainers, balls, rollers and sub-assemblies.

Note:

This item is not intended to cover hollow bearings.

Explanatory Notes:

A

B

Balls as covered by Item IL 1371 (e) may be identified among balls manufactured to the tolerances in table 1 or closer;

Rollers as covered by Item IL 1371 (e) may be identified among non-standard rollers, that is, rollers falling outside of the tolerances for graded rollers for standard bearings which are shown in table 2;

The above explanatory note applies to the rollers for bearings covered by sub-items (a)(2) and (b)(2). It does not apply to rollers for bearings covered by sub-item (a)(1) and (b)(1), because these are indicated by virtue of materials used.

Illustrative examples of tolerances for graded rollers for non-standard bearings are shown in table 3;